Secondary battery and electronic device

Abstract

A secondary battery capable of improving battery characteristics is provided. The secondary battery includes a cathode 21 containing a cathode active material capable of inserting and extracting an electrode reactant, an anode 22 containing an anode active material capable of inserting and extracting the electrode reactant, and an electrolyte containing a solvent and an electrolyte salt. At least one of the cathode 21, the anode 22, and the electrolyte contains a radical scavenger compound. The radical scavenger compound is a compound in which a group having a radical scavenger function exists as a matrix, to which one or more carboxylic metal bases or one or more sulfonic metal bases are introduced. Chemical stability of the cathode 21, the anode 22, or the electrolyte containing the radical scavenger compound is improved. Thus, at the time of charge and discharge, decomposition reaction of the electrolytic solution is easily inhibited.

Description

TECHNICAL FIELD[0001]The present invention relates to a secondary battery including a cathode, an anode, and an electrolyte and an electronic device including a secondary battery.BACKGROUND ART[0002]In recent years, portable electronic devices such as a video camera, a digital still camera, a mobile phone, and a notebook personal computer have been widely used, and it is strongly demanded to reduce their size and weight and to achieve their long life. Accordingly, as a power source for the portable electronic devices, a battery, in particular, a light-weight secondary battery capable of providing a high energy density has been developed.[0003]Specially, a secondary battery using insertion and extraction of lithium ions for charge and discharge reaction (so-called lithium ion secondary battery) is in practical use widely, since such a lithium ion secondary battery is able to provide a higher energy density than a lead battery and a nickel cadmium battery.[0004]The lithium ion seconda...

AI Technical Summary

Benefits of technology

[0021]In view of the foregoing problem, it is an object of the present invention to provide a secondary battery capable of improving the battery characteristics and an electronic device including the same.

[0024]According to the first secondary battery of the present invention, since at least one of the cathode, the anode, and the electrolyte contains the compound shown in Formula (1) or the nitrile compound shown in Formula (2), the chemical stability thereof is improved. Thereby, at the time of electrode reaction, the electrode reactant is easily inserted and extracted in the anode or the cathode, and decomposition reaction of the electrolyte is inhibited. Thus, the battery characteristics such as the cycle characteristics are able to be improved. Accordingly, the first secondary battery of the present invention is able to be suitably used, for example, as a power source for an electronic device such as a portable electronic device, an electric power tool, and a power source supply system.

[0025]According to the second secondary battery of the present invention, since at least one of the cathode and the anode contains the compound shown in Formula (3), the chemical stability of at least one of the anode and the cathode is improved compared to a case that at least one of the cathode and the anode does not contain the compound shown in Formula (3). Thus, at the time of charge and discharge, the cathode and the anode are hardly reacted with the electrolyte. Thus, the battery characteristics such as the cycle characteristics, the swollenness characteristics, and the reaction resistance characteristics are able to be improved. Accordingly, the second secondary battery of the present invention is able to be suitably used, for example, as a power source for an electronic device such as a portable electronic device, an electric power tool, and a power source supply system.

Problems solved by technology

However, although various studies have been made as described above, sufficient battery characteristics such as the cycle characteristics and the swollenness characteristics have not been obtained.

In particular, in recent years, as the high performance and the multi functions of the portable electronic devices have been developed, and the electric consumption thereof tends to be increased.

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